An off-state load disconnection detection circuit

Abstract

The invention discloses an off-state load disconnection detection circuit, which includes a switch module, a load on-off judging module and a control module, wherein the switch module is connected to the load circuit to be tested to provide current for the load circuit to be tested; the load on-off judging module Connected to the load circuit to be tested, used to receive the load voltage from the load circuit to be tested and generate a voltage judgment signal according to the load voltage; the control module is connected to the load on-off judgment module and the switch module, used to judge the load to be tested according to the voltage judgment signal Whether the circuit is disconnected, and the control switch module is continuously turned off when the load circuit to be tested is disconnected. The off-state load disconnection detection circuit of the present invention can identify whether the load circuit is disconnected when the power tube is switched off, and control the power tube to keep disconnected when the load circuit is disconnected, so as to prevent damage to the chip circuit.

Description

technical field [0001] The invention belongs to the technical field of detection circuits, and in particular relates to an off-state load disconnection detection circuit. Background technique [0002] The high-side power driver chip is used to provide output current for the ground load, the internal logic circuit of the chip controls the opening of the power tube, and the internal power tube of the chip provides current for the ground load. In order to understand the working state of the load circuit, it is necessary to detect whether there is an open circuit in the load circuit when the power tube is turned off. When the power tube of the chip is in the off state, and the load is disconnected due to an operation error or other reasons, the error status needs to be reported to the logic control circuit, and the power tube is turned off through the logic control circuit. The circuit that realizes this part of the function is an off-state load disconnection detection circuit....

AI Technical Summary

Problems solved by technology

[0004] However, in the load circuit open state, the load voltage V out close to the larger supply voltage V high , when V high When working in a wide range of voltage, it may cause damage to the post-stage shaping unit, which requires high withstand voltage for the post-stage shaping unit, and the shaping circuit is a high-voltage circuit, which occupies a large layout area

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